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Tape Data Sets z/OS DFSMS Using Data Sets SC23-6855-00 |
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The system can determine the optimum block size for tape data sets. The system sets the block size at OPEN on return from the DCB OPEN exit and installation DCB OPEN exit if:
Rule: For programming languages, the
program must specify the file is blocked to get tape system-determined
block size. For example, with COBOL, the program should specify BLOCK
CONTAINS 0 RECORDS.
The system-determined block size depends on the record format of
the tape data set. Table 1 shows the block sizes that
are set for tape data sets.
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Copyright IBM Corporation 1990, 2014
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